The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 71 GMC engine swap-arino

**Cali72K20** · 01-15-2025, 09:32 PM

10159550/10159552 are also 1987-95 heads that have the offset inner mounting holes too, pull a valve cover off to see what heads are installed.

01-15-2025, 09:32 PM	#11
Cali72K20 Senior Member Join Date: Aug 2013 Location: Northern Santa Barbara County, California Posts: 2,731	Re: 71 GMC engine swap-arino 10159550/10159552 are also 1987-95 heads that have the offset inner mounting holes too, pull a valve cover off to see what heads are installed.