H-I-J '76 Nova re-fit.

Glenn Briglio · 06-02-2019, 08:10 AM

Check out the Dart shp block.

Larry Hill · 06-02-2019, 09:41 AM

Check the new blocks before you send them off. The main bearing housing bore might surprise you. "If it ain't broke don't fix it"

Greg Reimer 7376 · 06-02-2019, 10:27 AM

I like the Dart block I bought for my Chevelle.It's quite thick, rather heavy, but nothing I could do to it would hurt it,barring a broken rod or something. You've had the crank checked and done so many times it probably isn't the problem, check and use i again if it's a steel crank. The production GM 350 blocks tended to be thin,sometimes you go through a lot of them before you find one with no core shift or thin places where it needs to be thick.It sounds like something is structurally weak in the block you have been using, something obviously moves when you torque it down if the results keep changing. Einstein said that the definition of insanity is when you try the same thing over and over expecting different results. This block sounds like you constantly try the right thing the same way each time, and different results keep popping up. Something is moving around and giving you different results each time. It could be a hidden crack, a soon to be crack, or some type of metallurgical flaw.It could result in disaster. Also, 4 speed cars are harder on a lot of things, the Dart block might be what's required to keep the cylinders round, the decks flat,and the main bearing line bores straight. The NHRA approved parts list has the correct part number for that block, and Summit ships them right to your porch.

Greg Reimer 7376 · 06-02-2019, 10:41 AM

The NHRA legal replacement part number for a 4 inch bore SBC with a 2 piece rear main seal is 31161111. Summit shows it in their catalog for $1718.26 on page 124. That's the March-April catalog.

Nmbr1GMfan · 06-02-2019, 11:22 AM

Quote:

Originally Posted by Greg Reimer 7376

The NHRA legal replacement part number for a 4 inch bore SBC with a 2 piece rear main seal is 31161111. Summit shows it in their catalog for $1718.26 on page 124. That's the March-April catalog.

That will for sure be my next one.

Nmbr1GMfan · 06-02-2019, 04:08 PM

Today we pulled the redneck A/C from the rafters for what will surely be another hot summer. Started pulling Racepak bits out of the boxes and found a spot for the logger just for something to do. I'll update on the block situation tomorrow, if I can pick one up local I'll have a plan in place pretty quick.

Jody Lang · 06-03-2019, 12:22 AM

So was the #3 main cap broke?

Nmbr1GMfan · 06-02-2019, 11:19 AM

Quote:

Originally Posted by Greg Reimer 7376

Einstein said that the definition of insanity is when you try the same thing over and over expecting different results.

Everything is absolutely correct, especially this.

06-02-2019, 08:10 AM	#1
Glenn Briglio VIP Member Join Date: Nov 2002 Location: Massapequa Park,NY Posts: 1,281 Likes: 1,893 Liked 969 Times in 307 Posts	Re: H-I-J '76 Nova re-fit. Check out the Dart shp block. __________________ 1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop.

06-02-2019, 09:41 AM	#2
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,633 Likes: 1,927 Liked 10,687 Times in 2,225 Posts	Re: H-I-J '76 Nova re-fit. Check the new blocks before you send them off. The main bearing housing bore might surprise you. "If it ain't broke don't fix it" __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

06-02-2019, 10:41 AM	#4
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	Re: H-I-J '76 Nova re-fit. The NHRA legal replacement part number for a 4 inch bore SBC with a 2 piece rear main seal is 31161111. Summit shows it in their catalog for $1718.26 on page 124. That's the March-April catalog.

06-02-2019, 04:08 PM	#6
Nmbr1GMfan VIP Member Join Date: Aug 2013 Posts: 1,763 Likes: 1,197 Liked 1,955 Times in 492 Posts	Re: H-I-J '76 Nova re-fit. Today we pulled the redneck A/C from the rafters for what will surely be another hot summer. Started pulling Racepak bits out of the boxes and found a spot for the logger just for something to do. I'll update on the block situation tomorrow, if I can pick one up local I'll have a plan in place pretty quick. __________________ Todd Greene

06-03-2019, 12:22 AM	#7
Jody Lang Member Join Date: Mar 2002 Posts: 306 Likes: 28 Liked 89 Times in 28 Posts	Re: H-I-J '76 Nova re-fit. So was the #3 main cap broke?

06-02-2019, 10:27 AM	#3
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	Re: H-I-J '76 Nova re-fit. I like the Dart block I bought for my Chevelle.It's quite thick, rather heavy, but nothing I could do to it would hurt it,barring a broken rod or something. You've had the crank checked and done so many times it probably isn't the problem, check and use i again if it's a steel crank. The production GM 350 blocks tended to be thin,sometimes you go through a lot of them before you find one with no core shift or thin places where it needs to be thick.It sounds like something is structurally weak in the block you have been using, something obviously moves when you torque it down if the results keep changing. Einstein said that the definition of insanity is when you try the same thing over and over expecting different results. This block sounds like you constantly try the right thing the same way each time, and different results keep popping up. Something is moving around and giving you different results each time. It could be a hidden crack, a soon to be crack, or some type of metallurgical flaw.It could result in disaster. Also, 4 speed cars are harder on a lot of things, the Dart block might be what's required to keep the cylinders round, the decks flat,and the main bearing line bores straight. The NHRA approved parts list has the correct part number for that block, and Summit ships them right to your porch.