502 block max horsepower?
#1
Junior Member
APPRENTICE
Thread Starter
Join Date: Aug 2004
Posts: 14
502 block max horsepower?
I have a 540 built by shafiroff that came in a car I bought. Just freshened it with JE pistons, bearings etc. Has eagle 4340 crank, h beam rods w/ L19 bolts. I am running a fogger on it and was wondering if anyone had any suggestions on max horsepower this block will handle. It's about 15:1 compression and I have already sprayed 150 shot with no problems. Do I dare try a little more squeeze? If so any tips on nos/ fuel jetting and fuel press.
#2
Senior Member
MASTER BUILDER
Join Date: Dec 2004
Location: out of my mind in Kalamazoo, MI
Posts: 179
Re: 502 block max horsepower?
Originally Posted by 71
I have a 540 built by shafiroff that came in a car I bought. Just freshened it with JE pistons, bearings etc. Has eagle 4340 crank, h beam rods w/ L19 bolts. I am running a fogger on it and was wondering if anyone had any suggestions on max horsepower this block will handle. It's about 15:1 compression and I have already sprayed 150 shot with no problems. Do I dare try a little more squeeze? If so any tips on nos/ fuel jetting and fuel press.
#4
Senior Member
RACING JUNKIE
Join Date: Sep 2007
Location: Belleville, IL
Posts: 658
I don't know about the cylinder wall thickness of the 502 blocks, but I ran a 427 tall deck truck block at .100 over bore, to 1200 dyno'd crank HP.
It gave up the ghost when I banged the blower from too much timing and not enough fuel. Put an "H" crack in the side of #5 cylinder.
It gave up the ghost when I banged the blower from too much timing and not enough fuel. Put an "H" crack in the side of #5 cylinder.
#7
Originally Posted by russ67chevelle
15:1 COMPRESSION AND ONLY GIVING HIM 600-700 HP?!?!?!???
#8
Junior Member
APPRENTICE
Thread Starter
Join Date: Aug 2004
Posts: 14
Yeah, it should be around 850 hp or so. It ran 8.50 in my 2000lb altered at 5800 ft in denver. 8.11@163 with a 150 shot. At lower altitude you can figure .6 sec faster. Wish I would have went back to Kansas and raced it before I got rid of the car. It went 8.000 one time at great bend before I had the heads ported. Ported the heads before I ever ran at denver but it seems to have picked up .5 sec. or so. My buddy from there runs 7.70's in kansas and 8.30's when he comes to denver. May never get in the 7's now with a heavy old chevelle! Anyways, it seems I may not want to hit it with a 300 shot. I'd rather not blow it up and crash the car. Heads flowed right under 400 cfm after the port job, 310 cfm before! Just some junk old 305cc brodix -2's. Block is not a bowtie. Wonder why Shafiroff ever put these together without a dart block? Has anyone seen any actual problems with these or is everyone just worried like I am? Sounds like the cylinder walls are a bit thin is the problem.