[R 70 Judge]

Is there room behind the tensioner assembly to retain my 12x crank trigger setup?

[darbikrash]

Originally Posted by R 70 Judge

Is there room behind the tensioner assembly to retain my 12x crank trigger setup?

Not sure. The 8 rib pulley stands off from the ATI balancer about 3/4", the space between balancer and the block might accomodate, hard to know without having the trigger wheel.

How are you getting the cam signal?

Sometimes a simpler approach is just to use the Holley dual sync distributor. This setup can also be configured for CNP/COP if you prefer individual coils.

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[R 70 Judge]

Originally Posted by darbikrash

Not sure. The 8 rib pulley stands off from the ATI balancer about 3/4", the space between balancer and the block might accomodate, hard to know without having the trigger wheel.

How are you getting the cam signal?

Sometimes a simpler approach is just to use the Holley dual sync distributor. This setup can also be configured for CNP/COP if you prefer individual coils.

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Thanks for the additional picture. It appears the pulley could be machined to squeeze in the crank trigger wheel between the balancer and pulley. ATI also makes a replacement shell with integrated magnets (can be configured for 12-1x) as an option. In the end it would not be a huge thing to figure it out.

I use a Holley dual-sync distributor for the cam signal. We initially got it running with only the dual-sync (cam and crank signals) but the timing was a bit finicky so we switched to the 12-1x with hall-effect sensor for more stability and resolution. I’m running Holley Smart Coils (CNP) with brackets to mount them on a Pontiac valve cover. If I wasn’t using smart coils, I’m confident the dual-sync would’ve worked just fine for all timing functions. The crank trigger is a Holley SBC 556-171 kit with a custom bracket to fit a Pontiac. On a side-note, I’m having some extra brackets made if anyone is interested in changing to a 12-1x setup. Just PM me directly so this thread isn’t muddied up.

Your LSA blower project is really cool! I look forward to more updates