I need some help coming up with a combination to go with my 350 4 bolt main block and pro comp 210 heads Im looking to make at or over 500hp on pump gas.

 

Sort of asking allot out of 350 cubes and heads that arent known to flow some real numbers.It might be possible with a 383 stroker.

 

It can be done but you are going to need a better head than that. I suggest looking into a Brodix or Trick flow head. You can even do it with an Edelbrock head. Chevy High Performance magazine did it awhile back. You are going to need a nice healthy cam and compression should be 10.5 or better.

 

afr 195s can get the job done with the help of a big *** cam.

 

High 590 or 600 lift roller cam, stroke the motor to a 383, RPM air gap, roller rockers, milodon or moroso pan, Electric water pump, holley double pumper 770CFM, 10-11:0 compression.

 

Here is a page from AFR's site:

http://airflowresearch.com/articles/article072/A-P1.htm

http://airflowresearch.com/articles/article054/A-P1.htm

 

He did not ask about other heads guys.


69camaro is right on track with what i was saying. It can be squeezed out of a 350 block, but stroking it up and getting all the ins and outs is a must, crank wiper and windage tray and all the works will be needed, unless you know a hell of a porter to get those cheap heads flowing better.

 

He didn't say about stroking it either

 

He mentioned a 350 block, not 350 ci.

 

By the time you get those heads ported (need about 280cfm at .600 lift), upgrade the springs for the cam you will need, get new guides for larger push rods...I think I would sell them and put the money towards some AFR's. Work out a budget before you jump in. That will help you make your decisions. I just built a 496 for my Monte Carlo. I thought I could save money by using the stock block and reworking the stock heads. By the time it was all said and done...I should have purchased a 502 crate!!

 

That is why i am building a 461, i was going 496, but the rotating assy alone was 1400$. I got a block that was bored over fresh, steel 454 crank, 990 square port heads, offenhauser intake, doe forged pistons and 7/16 dimple rods for 700$.

I will build more motor later, but for now the 461 is going to be fine.


Those heads will make you in the end with you would have gone with some Patriot heads, the pro comp line is not known for anything notable.

I scored a set of vortec heads, added screw in studs, springs, had the guides cut, all the works. A extra hundo after it was all said and done would have netted me a better head that would have yielded more power.

 

he wanted a power number, those heads won't suffice. stroking isn't always ideal for big power . matching everything together would make the best power.i bet he could make 500hp with a 355 with afr's and a good sized cam like a xr294hr

 

Lets get the OP to get back on here and give us a lil more details on what he wants to use and what he wants to do.

 

i understand what he is doing, he has the heads. might as well use them. i got a set of brodix 180 iron killers for 500 bucks with matched intake and other **** brand new. so i am going to build a small screamer for daily abuse. heh

 

Yea, those heads are said to flow about what a vortec head does, and vortec heads are 170cc intake runner.

A 355 will make 425 with the right cam pretty easily, a 383 can get to about 450. So if he did all the other ins and outs, he can get close to 500, but it will take more than it is worth to get that number.

 

you can make close to 450 with a set of vortecs and the right cam. no need to stroke it.

 

425 is close to 450.

 

what number would you rather have?

chevy high performance did a great build with those heads. everything new carb to pan costing 3200 bucks yielded 442hp and 452ft lbs

 

With the ported heads or untouched? I have seen to many vortec builds and you need to remember one thing, take engine builds with a grain of salt when it comes to the dyno numbers.

 

they were untouched.