I've read 3 books on building small block engines, and one of the books was Small Blocks on a Budget, and it seemed like they always used a 750 in their build. Even in their milder engines. But I also know a guy who has a LS powered rail dragster running a 600 cfm on it that makes it run better than the previous 750 dp. Who knows why? I have a 600 for my build, but I am planning on working on picking up a 750 and possibly a 670 avenger as well to see which is better.

 

well as for the 750 im gonna try it out on the car and see hows it runs, i thought that the stock quadrajet was a 750? i thought i read that on another site and the guy at the parts place told me the same but im gonna go with what you guys tell me over what some parts slinger does, but once again thanks for all the help guys and conversation i gotta say i really like this site its great to read all the topics its got great imformation and all of you guys just make it a great site even just to hang out and talk its by far the best site ive been to for car stuff ive got a plymouth duster roller and the best site i found for that stuff cant even compare to ya'll

 

oh i have a couple more questions these are a bit random and well haha im gonna say theyre comeplete noob questions
first one. how do you tell if an engine is a high reving engine or if its a lower reving engine? does the specific build determin that? ive read somewhere not sure if its true that the 327 is a higher reving engine then the 350 does that mean that it goes off engine size or is that inconclusive? i was thinking alot of smaller engines specifically rice rockets are alot higher reving arent they?

second question. how do i tell if my engine is a 4 bolt main or 2 bolt? thats something i wont be able to find out untill i rebuild and can look at the block right? or is there another way?

and if i seem to stupid with my questions feel free to just tell me to shut up or go somewhere else with em i wouldnt want to annoy

 

A rough rule of thumb is that the more "oversquare" an engine is (ratio of bore to stroke) the higher rpms it takes to maximize the hp. A 4 inch bore and 3.25 stroke 327 would theoretically reach maximum hp at a higher rpm than a 4 inch bore 3.46 stroke 350. All that being said, I know I was told by more than one source that when I went up 50 from a 350 to a 400 that the longer stroke would require a lower shift point to get the best ET, though the amount of oversquare difference isn't much because although thats a stroke increase of 0.29 inches its also a bore increase of 0.125. I have found I shift both engines at the same rpm for maximum effect. A lot depends on the head and cam combination, but these two engines are very similar in that respect, and the ets are about 0.4 seconds apart. I just finished the installation of a 4.125 bore 4.00 stroke 427 Saturday and am about peeing my pants waiting for some runs at the local strip.

 

You'll probably have to wait to pull your engine to determine for sure if it's 2 bolt or 4 bolt. Unless you're doing a really radical street, or strip motor the 2 bolt is a great block for most uses. I've built a lot of small and big blocks with 2 bolt mains that produced good numbers at the strip and held up well.
The theory about strokes being shorter than the bore is true, but only for comparison purposes. A 350 wont wind as high or as fast as a 327 or a 283, but a 396 with it's 4" bore and 3.76" stroke wont wind too fast even though it's a larger bore vs. stroke.
The real key is the smaller the bore the faster it will wind if the stroke is still smaller than the bore. That's why those tiny rice rocket engines wind so fast. Very small bores with even shorter strokes. But big long stroke engines give such great low end power that they work extremely well in the driving rpm's we use most. Not often that the average daily driver keeps his small or big Chevy motor winding at much over 3,000 rpms. Most driving is done below that, and an engine that will develope power right off idle to 4,500 is ideal for that type of driving.

 

okay thanks guys for helping me i appreciate it, say i want to eventually put a blower on my motor would a 2 bolt main hold up for that? haha idk if that will ever happen but id like to in the future after a good rebuild

 

Depends on the compression ratio, the blower and the percentage of boost the blower puts out. I personally would go a 4 bolt if I even thought about a blower later. You also need to decide for sure before rebuilding the motor as a blower motor needs much lower compression. If you run over about 8.5:1 it will need to be torn down again when you install the blower to lower static compression. You don't want to build a nice 10:1 carbureted engine and then put a blower on it and blow the bottom out.

 

alright thanks for all the help