Just bought an Edlbrock high flow base and AS&M large tube runners. I am putting them on a 350 with World Products sportsman II heads with LT4 cam and 1.6 rockers. The motor is supposed to put out 415 horse and 435 ft lbs torque. Is anyone running the same intake? It seems likethe base could use some cleaning up and porting. Has anyone run the same combination, and what is your opinion?
Thanks, Steve

 

The TPiS base is an Edelbrock base that has been cleaned up and ported.

I doubt that your combination will make the power you think it will.

 

Well its not exactly a stock 350. Its a build I found in Hot Rod magazine. It uses a 400 block zero deck 6 1/4 long rods, 327 crank and J&E flat top pistons with 10.5 to 1 compression. I am using a retro fit roller cam and lifters.

 

That is not my issue with the combo....

You've got a TPI intake thats stuck with an engine+heads+cam combo that wants to rev, TPI will kill it's power.

 

I agree it probably will lose some power, I got some good information off your site. There was one build I believe that got 400 horse and 500 ft lbs torque, but with a bigger cam. When I did my build I was afraid to go with a longer duration cam because of drivability issues, so I went a little more conservative. The engine in the magazine peeked at 5800 rpm. I doubt the TPI will go that high.

 

I have the Edelbrock base and a SR ... we needed 5 hours for porting the base ...

 

Thanks for the pictures. How about the runner ports? Got any pictures for that? And how much difference did your porting make?
Thanks

 

Doing some cleaning up on mine:




I didn't want to change the shape, since I do not know a lot about what is best. The cleaning up took many hours. Click My Corvette Pictures, by my avatar for more.

 

I don't know the difference to unported base/runners. The engine was stock before changing cam/intake. The SR runners didn't need much porting as the pre-owner did some.

A view through the intake ...

 

We had to use some washers to space up the fuel rail on one of the bases we had, but it had SVO injectors on it. Don't know if stock injectors would have that problem.

 

The injector binding problem is because the edelbrock fuel rail posts are too short. You should definitely put washers in there to avoid damaging the injectors.

 

I was thinking of useing Lt4 injectors I believe they are shorter so they may fit but I will definitly check to see if they bind .thanks for the replys

 

Was this engine carbed dyoned at that HP?If carbed,any TPI you add will not make nearly that much.You may see an increase in torque though,and that would be even more killer on the street if thats where your engine combo will spend most of its time.Or torque may fall down but be fatter at a lower rpm band,which is ideal for a street engine.

Btw,if you didnt know,the older GM ZZ4 crate engine made 355 HP in carbed form.Its very similar to the 88-91 350 TPI engine since it uses the same stock D port heads.The ZZ4 cam helps some too,but slap on a TPI to a ZZ4 crate engine and it wont make the 355 HP the engine is famous for with the carb.Its not saying carb is better,just the TPIs dont flow the air carb intakes do...a miniram or similar efi intake may take it to there or more.

However,if you keep the TPI style,drive your cars everyday and dont see 4,800-5,000 rpms all the time,the cars gonna pull like a rocket with nothing but torque ruling your tires.If youre building a car to make the best times mostly on the track,then a different intake will be one of your mods.

 

 

Bill, those are all good points that I have thought about, the reason I chose TPI is exactly what you said at the bottom of your post. The torque curve on the engine build is 400 ft lbs of torque from 2500 rpm all the way to 5300 rpm. So the flat torque curve makes the engine more fun to drive and thought it would be better suited for TPI.

 

Nice port work cuisinartvette! Is that a stock TPI manifold, or a aftermarket? Thanks!
Looks like a stock base, did you notice a large improvement? There is an article on comp cams that extrude honed a stock base and got numbers close to the Edlebrock base. I was thinking of porting my stock base and sending back the Edlebrock base. Thanks

 

That was a stocker (89), plenty of meat on thos e for portig. Couldnt see spending a bunch of $$ for an aftermarket that still needs some work.

 

No Problem with stock L98 injectors over here. With the shorter LS1 injectors I had to cut a few mm of the fuel rail posts.

 

If you wanted a fat, flat torque curve you should have left the stock 3.75" crankshaft in it. Why do you thinks guys are lining up to buy cranks like you've discarded, to build 383s? Based on what I've quoted you as saying at the top of this post, you went the wrong way. If you wanted an exercise in crank swaps, you could have built a 421 or a 434. Now THERE is torque!

RACE ON!!!

 

I understand what you're saying, I have built a 383 before, and may build another one-but this engine combination does a lot of other things than just a 350. I originally built the motor for an 83 El Camino, but, I have a lot of money in the motor and the torque specs seemed like they would work well with tune port. I'm not ready to build another motor at this time.