Thread: blower on a 400

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i have a 71sbc 400 that is .30 over and i have a 144 weiand blower wanted 2 know if that was a good combo for street use in my 81 Z28 (the sled)and would it be 2 much 2 take it .40 over i will be using kb-30cc dish pistons 4 the lower compression and a 76cc head with steam holes also i have a built 350 turbo with a b&m holeshot 2400 and a eaton posi with 373 thanx

Originally Posted by young audio

i have a 71sbc 400 that is .30 over and i have a 144 weiand blower wanted 2 know if that was a good combo for street use in my 81 Z28 (the sled)and would it be 2 much 2 take it .40 over i will be using kb-30cc dish pistons 4 the lower compression and a 76cc head with steam holes also i have a built 350 turbo with a b&m holeshot 2400 and a eaton posi with 373 thanx

My motor is .040 over so I don't see that as an issue. As for whether that blower is the right one for the 400, I have no idea. What number casting is your motor, 511, 509, or 817?

Originally Posted by TyphoonZR

My motor is .040 over so I don't see that as an issue. As for whether that blower is the right one for the 400, I have no idea. What number casting is your motor, 511, 509, or 817?

it is the 511 4bolt 1

If you look on the bottom of the block of the 4 bolt main on 400's, you can see why those blocks aren't the best for racing. The outside bolts of the maincaps hardly have any material around them and the block is prone to cracking. However for a street application this would be fine, as long as you keep it mild on the boost I'm sure. The two bolt main 400's are a lot better, the main caps are wider than other small blocks already, plus if you ever were worried about spinning bearings you could always get 4bolt splayed maincaps and machined. The two outside bolts are at an angle so they go into a part of the block where there is actually material there.

Originally Posted by 69elko

If you look on the bottom of the block of the 4 bolt main on 400's, you can see why those blocks aren't the best for racing. The outside bolts of the maincaps hardly have any material around them and the block is prone to cracking. However for a street application this would be fine, as long as you keep it mild on the boost I'm sure. The two bolt main 400's are a lot better, the main caps are wider than other small blocks already, plus if you ever were worried about spinning bearings you could always get 4bolt splayed maincaps and machined. The two outside bolts are at an angle so they go into a part of the block where there is actually material there.

oh i c what u mean i was going 2 use it just 4 on the street 2 tear up a couple of blocks then probabley sell the whole car but thats subject 2 change once its actually done (might fall in luv with it)