When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hello Lumpers,
I did a GM conversion a while ago, using a John Cars Kit I acquired from a donor Jag. The John Cars mounts are now bad and I tried to get the replacement mounts as recommended by Roger. (NAPA 602-1268) However, upon receiving them, they are too long and too small.
I contacted John and told him that I needed motor mounts but he wanted paperwork on the original installation, blah, blah, blah.
I contacted Jim at Suncoast and he can sell me his kit for the motor and transmission mounts for a decent price.
However, I have a few questions that I need answers to before I pull the trigger.
1. Engine Position.
2. Exhaust Pipes( mine was custom made)
3. Driveshaft length( 59" custom made 1 piece)
Has anyone done a conversion with the Suncoast kit? and if so can you post some pics with measurements of:
a. the valve cover to the firewall
b. front of engine to radiator support
c. height of engine
d. driveshaft length.
Here are pics of what I have with the John Cars kit.
My driveshaft is 59 inches long (1 piece)
As you can see, I can't go back very much. If I go forward, I will have to lose the clutch fan.
I need to see the difference in engine position between the two kits.
Any thoughts?
Old rubber mount New mount from Napa New mount installed
Sorry, but I just replaced the bad motor mounts and left the John's Kit in the car (now sold). Andrew at Jaguar Specialties should be able
to confirm your measurements.
Roger: As you can see the hole is 2.11 inches and the 602-1268 is 2.48 inches. So maybe the John Cars kit is not one size fits all. Also notice that the 602-1268 is different to yours.
Hi, I've never owned / worked on a Jag-rolet but I did work at a parts store. Does the mount have a part number on it or just on the box ? I solved a number of problems for customers with parts not fitting by double checking the specs / pictures, it was amazing how many times the wrong part was in the right box ! It might be worth going back to NAPA and measuring another mount just to double check that the first one was not just wrong or defective.
Yes. I did go back to Napa with the 602-1268 and the John Cars mount. They researched the 602-1268 with the catalog ans came up with the same dimensions I had. I also had Advance Auto, Oriellys and Autozone cross-reference the 602-1268 and they also came up with the same dimensions.
This is why I am suspicious that the John Cars mount is not one size fits all.
Application of NAPA 602-1268MakeModleEngineCCKWcylinderTypeYearCHRYSLERCOR DOBAL6-3.7LEngine Mount - FRONT RIGHT83-80CHRYSLERFIFTH AVENUEL6-3.7LEngine Mount - FRONT RIGHT1983CHRYSLERLEBARONL6-3.7LEngine Mount - FRONT LEFT81-78CHRYSLERNEW YORKERL6-3.7LEngine Mount - FRONT LEFT1982CHRYSLERNEWPORTL6-3.7LEngine Mount - FRONT RIGHT81-79CHRYSLERTOWN & COUNTRYL6-3.7LEngine Mount - FRONT RIGHT81-78DODGEASPENL6-3.7LEngine Mount - FRONT LEFT80-76DODGECHARGERL6-3.7LEngine Mount - FRONT LEFT1976DODGECHARGERL6-3.7LEngine Mount - FRONT LEFT74-73DODGECORONETL6-3.7LEngine Mount - FRONT RIGHT76-73DODGEDARTL6-3.2LEngine Mount - FRONT LEFT74-73DODGEDARTL6-3.7LEngine Mount - FRONT LEFT76-73DODGEDIPLOMATL6-3.7LEngine Mount - FRONT LEFT83-78DODGEMIRADAL6-3.7LEngine Mount - FRONT LEFT83-80DODGEMONACOL6-3.7LEngine Mount - FRONT RIGHT78-77DODGEST. REGISL6-3.7LEngine Mount - FRONT RIGHT81-79PLYMOUTHCARAVELLEL6-3.7LEngine Mount - FRONT LEFT83-78PLYMOUTHDUSTERL6-3.2LEngine Mount - FRONT RIGHT74-73PLYMOUTHDUSTERL6-3.7LEngine Mount - FRONT RIGHT76-73PLYMOUTHFURYL6-3.7LEngine Mount - FRONT RIGHT78-75PLYMOUTHFURY IL6-3.7LEngine Mount - FRONT RIGHT1973PLYMOUTHGRAN FURYL6-3.7LEngine Mount - FRONT LEFT83-80PLYMOUTHSATELLITEL6-3.7LEngine Mount - FRONT RIGHT74-73PLYMOUTHSCAMPL6-3.2LEngine Mount - FRONT RIGHT74-73PLYMOUTHSCAMPL6-3.7LEngine Mount - FRONT RIGHT76-73PLYMOUTHVALIANTL6-3.2LEngine Mount - FRONT RIGHT74-73PLYMOUTHVALIANTL6-3.7LEngine Mount - FRONT RIGHT76-73PLYMOUTHVOLAREL6-3.7LEngine Mount - FRONT RIGHT80-76
1. I dimly recall that Roger's source was an older Dodge van.
2. John is indeed "touchy" as to others using his mounts and not the kit!!
But, indeed as you surmise, his kits may use different Mopar mounts, dependent on the application. Thusly, paper to ID which kit and which mount. Perhaps he might relelent if a picture with measurements was sent via E mail. OTH, I dimly recall he is not keen on Email, but prefers FAX!!!! And, another, I recall he not doing EFI yoil the LT1 came along. hence not on your TBI!!!
3. Check Rock Auto. Search various MOPARS. Pictures might appear.
4. Check a Mopar parts place.
5. Trim the ones you have to fit.
Which holes on the block are used ? When I used the John's mounts, the instructions were for the forward holes. further forward than in the Cad. Thusly, engine set a bit back.
As I recall. the J-S or Sun Coast set the engine back as well.
A clue might be to see how the mounts were in your install!! Forward or to the rear?
Carl.
Last edited by JagCad; 03-20-2019 at 09:38 AM.
Reason: spell
Carl, there is nothing to trim. The 602-1268 is a lot larger than the hole it is supposed to fit into.
I will take your advice and visit a Mopar dealer to see what they come up with.
I've no idea if this will be useful or not, but here goes.....................
I've transplanted maybe a half a dozen engines into cars where they didn't belong (including a Jag) and I've always fabricated my own motor mounts or used a kit like this one to fab it up-
The bushings in these type of mounts are something common in the off-road market, most commonly found in spring eyes on Jeep leaf springs, but they are pretty common for all types of specialized suspension pieces. They fit inside a 1.5" DOM steel tube with a .125" wall and urethane ones are about $4 each. You can get them with IDs so you can sleeve them or just put a bolt through them. I've used urethane bushings for motor mounts with 500+ hp engines and never had a problem with them.
if you have any interest in fabing your own, I have some CAD renderings of the ones I used on my XJS V8 conversion. It was a LS not a SBC, but will give you the general idea.
I guess everyone is missing the point. I will purchase the Suncoast kit and then figure out whether I will have to do over the exhaust and driveshaft.
My hope was that someone had used the Suncoast kit and I would have able to compare the position of the engine with that of John Cars kit.
I will post the results upon completion.
03-19-2019, 02:24 PM
Conversion Kits: John Cars/Suncoast
