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Discussion in 'High Performance Modifications' started by ClassicRob1977, Jul 20, 2021.
Not 602 is a big block been here before.
The 602 is a 350 cubic inch circle track crate engine. It’s now called the CT350.
I’m pretty sure he isn’t talking about a big block.
Never mentioned anything about a 602 cubic inch BBC, just to be clear, the "602 Crate" I am referencing is the CT350 all iron SBC by GM and is one of the most used crates in many circle track categories. The step up on the "602 Crate" is the "604 Crate" it's the last 3 digits of the part numbers that most everyone uses.
It's basically a truck engine with a dual plane and a left hand turn oil pan and dual breathers on the left valve cover. I was using this as an example to the OP on what he could/should expect from his sbc upgrades being done on his super clean 77 Z28.
The dyno sheet actually shows the bore at 4.00 and stroke of 3.480. If this was a 602 cubic inch BBC dyno sheet I would have some explaining to do, unless it was only firing on 3 cylinders LOL.
LOL, 602 3 cyl. BBC.
Yeah stuck my foot in my mouth should have read the whole post. Must be due to the new med UW Madison put me on Lol.
x602 = iron rpo L31 Vortec heads & HFT cam. Essentially an rpo L31 Vortec w/ HFT cam & CT tin.
(discontinued) x603 = essentially a (discontinued) ZZ4 w/ CT tin and (discontinued) x113 rpo L98 alum heads.
x604 superseded x603 and essentially same as x603/ZZ4 but w/ much better alum Fastburn heads & CT tin. Much same as current ZZ6 but w/ CT tin.
all above share some rpo L31 heritage; for example here's a new replacement rpo L31
My son and I put vortec heads and a jegs intake on his z28 with a sniper injection system. We ended up having to put a 2" air cleaner on it and cut down the intake riser as it hit the hood
We did a similar thing this year on my sons z28. Got around 375hp at 5000rpm. Not bad for not a huge cost and minor changes (can and vortec heads)
Rob, Great post! Very detailed.. what size Bob’s fender cover did you order? Was it the Universal size for midsize? That looks a lot better than the little fender covers I’m using now.
You just call Bob and tell him what your working on and he takes care of the rest. Mine was made to order and took about 2-3 weeks to show up. Small price to pay if you ask me. I am much more at ease working on the car for obvious reasons. It stays put too. It doesnt slide down or back or side to side etc...as long as the hood hinges are up.